diff --git a/Source/dom/models/Library.js b/Source/dom/models/Library.js
index e4cd0703..b734b804 100644
--- a/Source/dom/models/Library.js
+++ b/Source/dom/models/Library.js
@@ -174,25 +174,12 @@ export class Library extends WrappedObject {
     const collector = MSForeignObjectCollector.alloc().initWithProvider(
       provider
     )
-    const shareableObjectRefsMap = collector.buildCollectionWithFilter(null)
-
-    const currentId = this.id
-    const currentName = this.name
-
-    const shareableObjectRefsForCurrentLib = toArray(
-      shareableObjectRefsMap
-    ).find(
-      (o) =>
-        o.library &&
-        String(o.library.libraryID()) === currentId &&
-        String(o.library.name()) === currentName
+    const shareableObjectRefs = toArray(
+      collector.collectImportableReferencesFromLibrary(this.sketchObject)
     )
 
-    if (!shareableObjectRefsForCurrentLib) {
-      return []
-    }
     const documentData = document._getMSDocumentData()
-    return toArray(shareableObjectRefsForCurrentLib.objectRefs).map((ref) => {
+    return toArray(shareableObjectRefs).map((ref) => {
       const obj = ImportableObject.fromNative(ref)
       obj._documentData = documentData
       return obj
diff --git a/Source/dom/models/__tests__/Library.test.js b/Source/dom/models/__tests__/Library.test.js
index 235f8799..04062966 100644
--- a/Source/dom/models/__tests__/Library.test.js
+++ b/Source/dom/models/__tests__/Library.test.js
@@ -42,9 +42,13 @@ function createLibrary(testOutputPath = outputPath()) {
 }
 
 test('should create a library from a document', () => {
-  createLibrary().then((lib) => {
-    expect(lib.type).toBe('Library')
-    expect(getLibraries().find((d) => d.id === lib.id)).toEqual(lib)
+  return createLibrary().then((lib) => {
+    try {
+      expect(lib.type).toBe('Library')
+      expect(getLibraries().find((d) => d.id === lib.id)).toEqual(lib)
+    } finally {
+      lib.remove()
+    }
   })
 })
 
@@ -55,49 +59,94 @@ test('should list the libraries', () => {
   expect(libraries[0].type).toBe('Library')
 })
 
-test('should be able to get the list of symbols to be imported', (_context, document) => {
-  createLibrary().then((lib) => {
-    expect(lib.getImportableSymbolReferencesForDocument(document)[0].type).toBe(
-      'ImportableObject'
-    )
+test('should be able to get the list of symbols to be imported', () => {
+  return createLibrary().then((lib) => {
+    try {
+      // Library.getImportableSymbolReferencesForDocument() and its sibling methods all expect
+      // an actual Document as an argument, not a DocumentData we get from the test environment
+      const document = new Document()
+      const importableSymbols = lib.getImportableSymbolReferencesForDocument(
+        document
+      )
+      expect(importableSymbols[0].type).toBe('ImportableObject')
+      expect(importableSymbols[0].name).toBe('Test')
+      expect(importableSymbols[0].objectType).toBe(
+        Library.ImportableObjectType.Symbol
+      )
+    } finally {
+      lib.remove()
+    }
+  })
+})
+
+test('should return references to already imported local copies of symbols if they exist', () => {
+  return createLibrary().then((lib) => {
+    try {
+      const document = new Document()
+      const refBeforeImport = lib.getImportableSymbolReferencesForDocument(
+        document
+      )[0]
+      expect(refBeforeImport.sketchObject.remoteReference()).toBeNull()
+
+      refBeforeImport.import()
+
+      const refAfterImport = lib.getImportableSymbolReferencesForDocument(
+        document
+      )[0]
+      expect(refAfterImport.sketchObject.remoteReference()).not.toBeNull()
+    } finally {
+      lib.remove()
+    }
   })
 })
 
 test('should disable a library', () => {
-  createLibrary().then((lib) => {
-    expect(lib.enabled).toBe(true)
-    lib.enabled = false
-    expect(lib.enabled).toBe(false)
-    lib.enabled = true
-    expect(lib.enabled).toBe(true)
+  return createLibrary().then((lib) => {
+    try {
+      expect(lib.enabled).toBe(true)
+      lib.enabled = false
+      expect(lib.enabled).toBe(false)
+      lib.enabled = true
+      expect(lib.enabled).toBe(true)
+    } finally {
+      lib.remove()
+    }
   })
 })
 
 test('should get the lastModifiedAt date', () => {
-  createLibrary().then((lib) => {
-    expect(lib.lastModifiedAt instanceof Date).toBe(true)
+  return createLibrary().then((lib) => {
+    try {
+      expect(lib.lastModifiedAt instanceof Date).toBe(true)
+    } finally {
+      lib.remove()
+    }
   })
 })
 
 test('should get the document of the library', () => {
   const testOutputPath = outputPath()
-  
-  createLibrary(testOutputPath).then((lib) => {
-    const libDocument = lib.getDocument()
-
-    expect(libDocument.type).toBe('Document')
-    expect(libDocument.path).toBe(
-      String(
-        NSString.stringWithString(
-          `${testOutputPath}/sketch-api-unit-tests-library.sketch`
+
+  return createLibrary(testOutputPath).then((lib) => {
+    try {
+      const libDocument = lib.getDocument()
+
+      expect(libDocument.type).toBe('Document')
+      expect(libDocument.path).toBe(
+        String(
+          NSString.stringWithString(
+            `${testOutputPath}/sketch-api-unit-tests-library.sketch`
+          )
         )
       )
-    )
+    } finally {
+      lib.remove()
+    }
   })
 })
 
 test('should remove a library', () => {
-  createLibrary().then((lib) => {
+  return createLibrary().then((lib) => {
     lib.remove()
 
     expect(getLibraries().find((d) => d.id === lib.id)).toBe(undefined)
diff --git a/webpack.tests.config.js b/webpack.tests.config.js
index 95615102..0e42c2c7 100644
--- a/webpack.tests.config.js
+++ b/webpack.tests.config.js
@@ -185,49 +185,48 @@ function source(identifier, tests) {
     // Runs all test suites
     const numSuites = Object.entries(suites).length
     let results = []
+    let promise = Promise.resolve()
 
     Object.entries(suites).forEach(([suiteTitle, val], index) => {
       const numTests = Object.entries(val.source.tests).length
 
       Object.entries(val.source.tests).forEach(([title, test], testIndex) => {
-        console.log(`Running test: ${suiteTitle} ${title}`)
-
-        let status = 'pending'
-        let failureReason
-
-        try {
-          expect.resetAssertionsLocalState()
-
-          // All tests are given the plugin command context and a new document data
-          // object.
-          //
-          // Note: This is not a full Document instance wrapping MSDocument. Using
-          // MSDocument slows down tests massively, so we rely on the private API
-          // creating document data from MSDocumentData.
-          test(context, createDocumentData())
-          status = 'passed'
-        } catch (err) {
-          status = 'failed'
-          failureReason = getTestFailure(err)
-        }
-
-        const fraction =
-          index / numSuites + (testIndex + 1) / numTests / numSuites
-
-        results.push({
-          ancestorTitles: [suiteTitle], // we don't have nested test suites in the API but sticking to Jest types anyway.
-          fullName: `${suiteTitle} ${title}`,
-          status,
-          title,
-          relativePath: `.${val.path.split(/SketchAPI/)[1]}`,
-          failureReason,
-        })
-
-        if (!onProgress) return
-
-        onProgress({ fraction, results })
+        promise = promise
+          .then(() => {
+            console.log(`Running test: ${suiteTitle} ${title}`)
+            return test(context, createDocumentData())
+          })
+          .then(() => {
+            results.push({
+              ancestorTitles: [suiteTitle],
+              fullName: `${suiteTitle} ${title}`,
+              status: 'passed',
+              title,
+              relativePath: `.${val.path.split(/SketchAPI/)[1]}`,
+              failureReason: undefined,
+            })
+          })
+          .catch((err) => {
+            results.push({
+              ancestorTitles: [suiteTitle],
+              fullName: `${suiteTitle} ${title}`,
+              status: 'failed',
+              title,
+              relativePath: `.${val.path.split(/SketchAPI/)[1]}`,
+              failureReason: getTestFailure(err),
+            })
+          })
+          .then(() => {
+            if (onProgress) {
+              const fraction =
+                index / numSuites + (testIndex + 1) / numTests / numSuites
+              onProgress({ fraction, results })
+            }
+          })
       })
     })
+
+    return promise
   }
 
   return `
@@ -298,7 +297,10 @@ function source(identifier, tests) {
 
     console.log(\`🏇 Running \${Object.keys(testSuites).length} test suites…\`)
 
-    const result = runner({ 
+    const { createFiber } = require('sketch/async')
+    const fiber = createFiber();
+
+    runner({ 
       context,
       expect,
       suites: testSuites,
@@ -314,19 +316,11 @@ function source(identifier, tests) {
       },
       prepareStackTrace
     })
-
-    const data = NSString.alloc().initWithString(JSON.stringify(result, null, 2))
-    const err = MOPointer.alloc().init()
-
-    data.writeToFile_atomically_encoding_error(
-      output,
-      false,
-      NSUTF8StringEncoding,
-      err
-    )
-
-    console.log('✅ Test results saved to: ' + output)
-    sketch.UI.message('✅ Test results saved to disk.')
+    .finally(() => {
+      console.log('✅ Test results saved to: ' + output)
+      sketch.UI.message('✅ Test results saved to disk.')
+      fiber.cleanup()
+    })
   }
   `
 }